有以下页面显示我的讯息，用户可以点击右上角的编辑按钮进入删除状态。点击编辑按钮后，按钮文字改为“取消”，左上角的按钮变为“全选”，同时显示底部工具条带有“删除”按钮

实现起来挺简单的，在正常状态下点击编辑按钮的方法内写入：

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self.navigationController?.setToolbarHidden(false, animated: true)
var btnDelete = UIBarButtonItem(title: "删除", style: UIBarButtonItemStyle.Plain, target: self, action: "deleteAction")
self.setToolbarItems([btnDelete], animated: true)

左上角的按钮改为“全选”

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var selectAllButton = UIBarButtonItem(title: "全选", style: UIBarButtonItemStyle.Plain, target: self, action: "selectAll")
navigationItem.leftBarButtonItem = selectAllButton

 so easy!!!